Judge Andrew Napolitano said U.S. special counsel Robert Mueller, who is investigating alleged Russian interference in the 2016 election, reportedly subpoenaing Deutsche Bank is dangerous for President Donald Trump.

Mueller has asked Germany’s largest bank for data on accounts held by President Trump and his family, according to Reuters Opens a New Window. .

“Deutsche Bank was his go-to lender in the years that he was developing real estate in New York City. This is an area that the president profoundly did not want to be investigated. In fact, the president publically said to … Bob Mueller ‘stay away from my personal finances, my family finances and my corporations finances,’” Judge Napolitano told FOX Business’ Stuart Varney on “Varney & Co.”

Judge Napolitano added that if there is any involvement between the Trump family, President Trump, the Trump organization, the campaign and the Russians, especially if it’s monetary, that could be “very dangerous for the president.”